Unable to delete entries from keychain
I have been having trouble connecting to Outlook (which gets stuck in a login loop when I try to add an account) and all the advice recommends deleting the relevant entries from the keychain. Unfortunately, when I go to keychain access, the delete option is not available - it's greyed out, and right clicking then selecting delete does nothing. The entries there, at least for this, must have transferred when I brought things over my previous Mac, but I don't have the same problem with keychain access there. I don't have this connected to iCloud. Does anyone have other suggestions of why I cannot clear entries?
Note this is an M1 Mac - support suggested resetting PRAM, etc. but that seems to be irrelevant to this model.
MacBook Air 13″, macOS 11.2